■ Safety relief valve:
The safety relief valve protects the system against excessive pressure. It is factory set.
■ Safety pressure monitor (Machine with refrigerated dryer):
The safety pressure monitor protects the refrigerant circuit against excessive pressure. It can‐
not be set.
■ Door interlock switch:
The machine will stop automatically if a safety interlocked door or panel is opened or removed.
■ Housing and covers for moving parts and electrical connections:
Protect against accidental contact.
4.4 Operating modes and control modes
4.4.1 Machine operating modes
STOP
The machine is connected to the power supply.
The
voltage applied to controller
LED lights green.
The machine is switched off. The
ON
LED is extinguished.
READY
The machine has been activated with «ON»:
■ The
ON
LED lights green.
■ The drive motor is stopped.
■ The inlet valve is closed.
■ The minimum pressure/check valve isolates the oil separator tank from the air system.
■ The venting valve is open.
The compressor motor starts as soon as pressure is demanded.
In addition, timer and/or remote control may affect the start of the motor.
LOAD
The compressor motor runs under load.
■ The inlet valve is open.
■ The compressor block delivers compressed air to the system.
IDLE
The compressor motor runs unloaded with low power consumption.
■ The inlet valve is closed.
■ The minimum pressure/check valve isolates the oil separator tank from the air system.
■ The venting valve is open.
A small volume of air circulates through the bypass bore in the inlet valve, through the compressor
block and back to the inlet valve via the venting line.
4 Design and Function
4.4 Operating modes and control modes
9_5875 33 USE
Operator Manual Screw Compressor
SM Tri-Voltage, SIGMA CONTROL 2
25
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